水下自激吸气式射流装置冲击力时频特性分析  

Analysis of impact time-frequency characteristics for underwater self-excitation inspiration pulsed jet devices

作　　者：刘新阳[1] 朱安福[1] 高传昌[1] 胡亚州 解克宇 

机构地区：[1]华北水利水电大学电力学院,郑州450045

出　　处：《振动与冲击》2016年第24期213-220,共8页Journal of Vibration and Shock

基　　金：国家自然科学基金项目(51309099)

摘　　要：利用水下射流循环试验系统对水下自激吸气式射流装置进行了冲击试验,得到了装置吸气和不吸气条件下冲击力时域波形,运用第二代小波变换和Wigner-Ville分布相结合的方法提取了冲击力时频特性,研究了装置吸气和不吸气条件以及不同围压和靶距下冲击力频带能量分布规律。结果表明,存在最优下喷嘴直径使装置的冲击力时域特征参数最佳;装置冲击力能量主要集中在低频带,且围压、靶距和吸气对频带能量比影响较大;吸气对装置冲击力频率成分、能量密度分布和脉冲效果均有明显影响,而围压和靶距只对能量密度分布和脉冲效果影响较大;碰撞体测点压力反映了装置聚能和释能的状态且与冲击力能量密度分布存在着对应关系。The impact experiment of an underwater self-excited pulsed jet device was conducted through a circulation experiment system of an underwater jet. The impact time domain waveform was obtained. The time-frequency characteristics of impact was extracted by the method of integrating the second generation wavelet with Wigner-Ville distribution. The energy distribution law of impact frequency band was studied in inspiration and non-inspiration conditions,different confined pressure,and target distance. The results show that there exists an optimal below nozzle diameter that can make the impact time domain characteristic parameters maximized. The impact energy of device mainly concentrates on low frequency band. Confining pressure,standoff distance and inspiration have large influence on frequency band energy. Inspiration has obvious influence on the impact frequency components, energy density distribution,and pulse effect,but confining pressure and standoff distance only have great influence on the impact energy density distribution and pulse effect. The pressure of collision body measuring point reflects the state of energy accumulation and energy release of device,and has corresponding relationship with the impact energy density distribution.

关 键 词：水下 自激吸气 射流 冲击力 时频特性 

分 类 号：TE248[石油与天然气工程—油气井工程]